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CVE-2026-18726— Open-iscsi: open-iscsi: denial of service in iscsiuio router advertisement parsing

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Open-iSCSI Open-iSCSI是Open-iSCSI组织开源的一个网络存储连接工具。 Open-iSCSI存在资源管理错误漏洞，该漏洞源于对特制ICMPv6路由器通告处理不当，攻击者可通过发送带零长度选项的报文触发无限循环，导致拒绝服务，并存在越界读取风险。

CVSS 6.5 · Medium EPSS 0.21% · P12

Affected Version Matrix 2

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
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I. Basic Information for CVE-2026-18726

Vulnerability Information
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Vulnerability Title
Open-iscsi: open-iscsi: denial of service in iscsiuio router advertisement parsing
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in open-iscsi. This vulnerability allows a remote attacker on the same local network segment to cause a Denial of Service (DoS) in the iscsiuio daemon. By sending a specially crafted Internet Control Message Protocol version 6 (ICMPv6) Router Advertisement with a zero-length option, the attacker can trigger an infinite loop. This leads to sustained CPU usage, rendering the daemon unresponsive and impacting system availability. A secondary risk of out-of-bounds reads exists with a short IPv6 payload, though no memory corruption or data exposure has been confirmed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
Open-iSCSI 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open-iSCSI Open-iSCSI是Open-iSCSI组织开源的一个网络存储连接工具。 Open-iSCSI存在资源管理错误漏洞，该漏洞源于对特制ICMPv6路由器通告处理不当，攻击者可通过发送带零长度选项的报文触发无限循环，导致拒绝服务，并存在越界读取风险。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-18726

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III. Intelligence Information for CVE-2026-18726

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Vendor Advisories for CVE-2026-18726 (2)

Same Patch Batch · Red Hat · 2026-08-12 · 19 CVEs total

CVE-2026-72526 9.9 CRITICAL Multicloud-integrations: multicloud-integrations: pull-model propagation allows hub tenant
CVE-2026-72508 9.9 CRITICAL Multicloud-operators-subscription: multicloud-operators-subscription: hub and spoke servic
CVE-2026-73268 9.9 CRITICAL Cluster-curator-controller: cluster-curator-controller: spec.install.overridejob allows ar
CVE-2026-73269 9.9 CRITICAL Cluster-curator-controller: cluster-curator-controller: tenant-controllable trigger create
CVE-2026-70398 9.6 CRITICAL Multicloud-integrations: multicloud-integrations: gitopscluster.spec.argoserver.argonamesp
CVE-2026-71471 9.0 CRITICAL Acm-search-v2-rhel9: search-v2-operator: hub search cr collector.imageoverride propagated
CVE-2026-13622 8.8 HIGH Kubevirt: virt-handler-rhel9: kubevirt: virt-handler migration proxy follows symlinks allo
CVE-2026-71473 8.5 HIGH Acm-search-v2-rhel9: search-v2-operator: addonfactory.getvaluesfromaddonannotation enables
CVE-2026-73122 7.7 HIGH Multicloud-operators-channel: multicloud-operators-channel: auto-generated role grants eve
CVE-2026-66878 7.7 HIGH Multicloud-operators-subscription: multicloud-operators-subscription: fetchchannelreferenc
CVE-2026-19654 7.5 HIGH Rsyslog: a configuration-dependent issue in rsyslog's optional imptcp input module can all
CVE-2026-71469 7.5 HIGH Acm-search-v2-api-rhel9: search-v2-api: unbounded tokenreviews cache allows unauthenticate
CVE-2026-18727 6.5 MEDIUM Open-iscsi: open-iscsi: integer underflow in iscsiuio dhcpv6 parsing
CVE-2026-71846 6.5 MEDIUM Insights-client: insights-client: clusterrole grants cluster-wide secrets get/list/watch b
CVE-2026-64927 6.4 MEDIUM Multicloud-operators-channel: multicloud-operators-channel: cross-namespace secret and con
CVE-2026-18663 5.9 MEDIUM 389-ds-base: 389-ds-base: pre-authentication double-free in get_ldapmessage_controls_ext()
CVE-2026-19130 5.8 MEDIUM Provider-credential-controller: provider-credential-controller: cross-namespace credential
CVE-2026-19548 5.5 MEDIUM Binutils: binutils: multiple use-after-free in add_archive_element via lto plugin processi

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-835

V. Comments for CVE-2026-18726

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